1. The spectrum of the scattered photons is termed the Raman spectrum. 2. If the scattered photon still has enough energy, the process may be repeated. 3. This is done by creating a photon of known wavelength and measuring the wavelength of the scattered photon . 4. In particular the minimum uncertainty is when the scattered photon has limit energy equal to the incident observing energy. 5. With a bright star the scattered photons are sufficient to expose the film and make a slightly larger image. 6. Momentum and energy conservation require that these are equal to the momentum and energy loss of the scattered photon . 7. Compared to a confocal microscope, photon detection is much more effective since even scattered photons contribute to the usable signal. 8. A hemispherical semiconductor would also work, with the flat back-surface serving as a mirror to back-scattered photons . 9. This constraint arises from the fact that in RIXS the scattered photons do not add or remove charge from the system under study. 10. It is a photon-in / photon-out spectroscopy where one measures both the energy and momentum change of the scattered photon .
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